JPH0717161B2 - One wheel management machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of a transmission case, and particularly to a wide first space portion on a side where a transmission mechanism is incorporated and a side where a drive force transmission mechanism for a drive wheel is incorporated. The second space portion is narrower than the transmission mechanism built-in side, and the entire case is integrally molded with a tapering taper so as to gradually become thinner than the first space side toward the insertion hole side of the wheel shaft. The present invention relates to a one-wheel management machine in which one drive wheel is arranged on one side of the second space section at the lower part of the section.

[Technical Background of the Present Invention]

Generally, the one-wheel management machine is basically a simple machine with a small structure and mechanism, and at the same time, it is inexpensive because of its simple structure and easy to attach / detach working parts such as rotary,
Moreover, the range of work has been expanded to include a wide range of applications including plowing, crushing, slaughtering, uplanding, upland farming, orchard management (for example, crop-to-crop narrow management), control, mowing, fertilization, and sowing. Therefore, it can be said that the frequency of use is very high especially as a machine that meets unique conditions such as small plot fields like Japan, soft swamps, and slopes. However, most of the specific structures of the one-wheel management machine as described above have a relatively small engine mounted on the upper front part of the machine base, and the one-wheel drive wheel driven by the engine is arranged below the engine. At the same time, a work machine is arranged in the lower rear part of the machine base, and a person who carries out the work carries out a predetermined work by holding a handle attached to the rear of the machine base and attached to the hand.

The structure of the transmission case in the one-wheel management machine having the above-described structure, in particular, the insertion arrangement of the drive chain for the drive wheels is continuous and integrated with one side of the first space for accommodating the transmission gear mechanism. The actual situation is to utilize the second space portion for inserting the chain that is formed by projecting. For this reason, the drive wheels are attached to the wheel shaft inevitably on the side of the transmission case that is offset from the center.Therefore, a single-wheel management machine that employs the transmission case having such a structure maintains the balance of the entire machine. It was necessary to pay close attention to the arrangement of various devices mounted on the machine base, especially the engine.

In addition, the drive force transmission means for transmitting a predetermined drive force to the work machine located behind the drive wheels is a sprocket (pulley) on the PTO shaft that is projected outside by the mission case.
The chain (belt) wound around this sprocket is wound around the sprocket of the working machine to transmit a predetermined driving force to the rotary. Therefore, in the above-mentioned mission case of the single wheel management machine, the transmission system of the drive wheels is housed in the mission case, and the transmission system of the driving force for the working machine is the PTO which is projected outside the mission case as described above. Since the structure is carried out via a shaft, sprocket (pulley), chain (belt), or a rotary shaft is provided so as to project, driving force transmission means such as a sprocket (pulley), chain (belt), etc. is arranged on the outer periphery of the transmission case. Had been set up. Therefore, it is necessary to secure a wide space around the mission case because the accessories such as sprockets (buri) and chains (belt) are attached to the outer circumference of the mission case as described above. Since the shape is large and the position of the PTO shaft facing the mission case is often on the side of the case, the drive force transmission means of the working machine must be located on the side of the mission case. In addition, it is difficult to equip the work machine mounting position with the axis line of the machine base, and there is also a constraint that it is not possible to easily make a design change to bring the work machine closer to the drive wheel side. It was

In addition, the above-mentioned one-wheel management machine tends to have a complicated work machine driving force transmission means, that is, a mechanism such as a sprocket (pulley) and a chain (belt) attached to the PTO shaft. Since there is a large amount of dust, there is a problem that during the work process, such exposed areas are entangled with dirt, dust, and even vegetation, and also hinder the car washing work after the work.

Furthermore, in the above-mentioned one-wheel management machine, the distance from the drive wheel to the working machine may become too wide depending on the means for taking out the driving force transmission system of the working machine, that is, the means for transmitting the driving force from the PTO shaft to the working machine. Therefore, maneuverability is quite difficult, for example, when turning a single wheel management machine in a small space in a small space, and especially when the point of such structure is extreme, the width of the machine base becomes wide and the ground clearance up to the engine is high. It was accompanied by a defect that the field of vision in front of the person was obstructed.

[Means and Actions for Solving Problems]

The present invention has been made to solve the above problems, in which an engine is mounted on the upper front part of the machine base, a transmission case is mounted on the rear of the engine, and one drive wheel is mounted on the lower front part of the machine base. In a single-wheel management machine in which a working machine is arranged behind a drive wheel, the structure of the transmission case has a wide first space on the side where the transmission mechanism is installed, and Second
The space is biased to one side of the first space and is narrower than the built-in side of the transmission mechanism, and the entire case is integrally molded with a taping taper so as to be gradually thin toward the insertion hole side of the wheel shaft. By disposing one drive wheel on the one side of the second space below the first space, the structure of the mission case can be simplified and the mission case can be made compact, and the mounting position of the drive wheel can be minimized. It is located closer to the center of the transmission case, improving the balance performance of the entire machine, allowing the transmission to be as close to the engine as possible and laying out in a low position, and lowering the center of gravity of the entire machine and making it even more compact. In addition, the transmission case is manufactured and integrated by integrating the transmission case. It is intended to provide one wheel tiller which can simplify the assembly process employing a mass production.

〔Example〕

FIG. 1 and FIG. 2 are diagrams for explaining in detail one embodiment of the one-wheel management machine according to the present invention.

In the figure, 1 is a single wheel management machine, 2 is its machine base, 3 is an engine mounted on the upper front part of the machine base 2, 4 is drive wheels (one wheel) arranged on the lower front part of the machine base 2, 5 Is a work machine (rotary) arranged behind the drive wheels 4, 6 is a mission case arranged behind the machine base 2, and 7 is a handle which is provided behind the machine base 2.

By the way, the transmission case 6 has a wide first space A in which the transmission mechanism is incorporated, a second space B in which the drive wheels 4 are incorporated, and a second space as shown in a cross section in FIG. Is a neck portion of one side of the first space A [which is biased to the left side in the present embodiment (see FIG. 2)], and is gradually tapered toward the wheel shaft 4b side to form a tapered taper so that the entire case is integrated. It is composed of a molding machine.

The one wheel management machine 1 is a management machine driven by a belt 10 wound between a drive pulley 8 arranged on the side of the engine 3 and a driven pulley 9 arranged on the side of the mission case 6 as shown in the figure. The driving force of the drive wheels 4 is transmitted by the chain 11 housed in the second space B.
Further, the driving force of the rotary 5 is the bevel gear 12a at the upper end of the drive shaft 12 which is exposed to the inside of the first space A.
Is engaged with a final gear 6a that constitutes a mission gear group, and a bevel pinion attached to the lower end of the drive shaft 12 is engaged with a bevel gear fixed to a tine shaft 12b so that it is finally transmitted to the rotary 5. Made of

The transmission case 6 having the bevel gear 12a at the upper end of the drive shaft 12 for driving the rotary 5 facing inside is fixed to the machine base 2 with its upper part positioned behind the machine base 2 and the drive wheels 4 The wheel shaft 4b is mounted so as to be tilted so as to be positioned substantially directly below the engine 3, and the drive shaft 12 of the rotary 5 is positioned diagonally rearward on the tine shaft 12b side with the upper lower surface of the transmission case 6 as the base end. It is installed at least.

The drive shaft 12 of the rotary 5 is attached to the mission case 6 by mounting a ball bearing in an insertion hole 6b provided in the mission case 6 and supporting a bevel gear 12a attached to the inner end of the drive shaft 12. Has been.

In the figure, O ₁ is an input shaft, O ₂ is a counter shaft, O ₃ is a final shaft, O ₄ is a shift fork shaft, and O ₅ is a shift fork shaft.

Hereinafter, the operation of the single wheel management machine according to the present invention will be described based on the above embodiment.

That is, as shown in FIG. 2, the one-wheel management machine 1 having the above-described structure has the first space portion A provided above the transmission case 6 to incorporate the transmission gear mechanism, and the first space below the transmission case 6. The drive wheel 4 is provided with a second space portion B which is biased to one side of the portion and is narrower than the side where the transmission mechanism is incorporated, and which is tapered toward the insertion hole side of the wheel shaft 4b to form a taper taper so as to be gradually thin. Since the chain 11 for driving the drive shaft is inserted and arranged, the drive wheel 4 mounted on the wheel shaft 4b can be mounted as close to the center of the transmission case 6 as possible.
Therefore, various devices mounted on the machine base 2 can be mounted in a well-balanced manner, and the performance with respect to the balance of the entire machine can be improved. Further, the transmission case 6 has a predetermined draft taper inside the entire case including the first space portion A and the second space portion B. Therefore, when molding the transmission case 6, the entire case is integrally formed. Since it can be molded, the case molding process can be simplified and the assembly and the like can be simplified.

On the other hand, the one-wheel management machine 1 is a management machine driven by a belt 10 wound between a drive pulley 8 arranged on the side of the engine 3 and a driven pulley 9 arranged on the side of the mission case 6. The driving force of the wheel 4 is the second space B
The driving force of the rotary 5 is transmitted by the chain 11 housed inside, and the bevel gear 12a at the upper end of the drive shaft 12 facing the inside of the first space A is transferred to the final gear 6a constituting the mission gear group. The bevel pinion attached to the lower end of the drive shaft 12 is engaged with the bevel gear fixed to the tine shaft 12b and finally transmitted to the rotary 5. It goes without saying that the driving force for the rotary 5 can be taken out as well as the taking-out means for the driving force in the conventional one-wheel management machine.

In addition, as described above, the drive force for the rotary 5 is taken out to the inside of the first space portion A, and the drive shaft is formed.
Since the bevel gear 12a attached to the upper end of 12 meshes with the final gear 6a that constitutes the mission gear group and is taken out, the drive shaft 12 is replaced with the tine shaft 12a.
It can be arranged in the center of b with a simple structure, and as a result, the rotary 5 includes the machine base 2 including the engine 3.
Since it can be arranged in a well-balanced position substantially directly under the center of the vehicle, it is possible to provide a one-wheel management machine that is excellent in running stability and maneuverability.

〔The invention's effect〕

As described in detail above, according to the present invention, an engine is mounted on the upper front part of the machine base, a transmission case is mounted on the rear side of the engine, and one drive wheel is mounted on the lower front part of the machine base. In a single wheel management machine in which the machine is arranged, the structure of the transmission case is such that the first space portion on the side where the transmission mechanism is incorporated is wide and the second space portion on the side where the drive force transmission mechanism for the drive wheel is incorporated is defined. The first case is integrally formed with a taper that is biased to one side of the first space and is narrower than the side where the transmission mechanism is installed, and faces the insertion hole side of the wheel shaft so as to be gradually tapered. By arranging one drive wheel on the one side of the second space at the lower part of the section, the structure of the mission case can be simplified and the mission case can be made compact. , The drive wheels are mounted as close to the center of the transmission case as possible to improve the performance of the balance of the entire machine, and the transmission can be placed as close to the engine as possible, so that it can be laid out in a low position. It is possible to provide a single-wheel management machine that can be made compact and further compact, and that the transmission case can be integrated to simplify the manufacturing and assembling steps of the transmission case and adopt a mass production system.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a single wheel management machine according to the present invention, and FIG. 2 is a cross-sectional plan view of a transmission case of the same single wheel management machine. 1 ... One wheel management machine, 2 ... Machine stand, 3 ... Engine, 4 ...
… Drive wheel, 4b …… Wheel shaft, 5 …… Work machine (rotary), 6 …… Transmission case, 6a …… Final gear, 6b …… Insertion hole, 7 …… Handle, 8 …… Drive pulley, 9 ... ... driven pulley, 10 ... belt, 11 ... chain, 12 ... drive shaft, 12a ... bevel gear, 1
2b ...... tine shaft, A ...... first space, B ...... second space, O ₁ ...... input shaft, O ₂ ...... countershaft, O ₃ ...... final shaft, O ₄ ...... shift Fork shaft, O ₅ ... Shift fork shaft.

Claims (1)

[Claims] 1. An engine is mounted on the front upper part of the machine base, a transmission case is mounted on the rear of the engine, one drive wheel is arranged on the lower front part of the machine base, and a working machine is arranged behind the drive wheel. In the one-wheel management machine, the structure of the transmission case has a wide first space on the side where the transmission mechanism is incorporated, and a second space on the side where the drive force transmission mechanism for the drive wheels is incorporated. Is narrower than the built-in side of the transmission mechanism,
In addition, the entire case is integrally formed with a taper to face the insertion hole side of the wheel shaft so as to be gradually thin, and one drive wheel is arranged on one side of the second space portion under the first space portion. One wheel management machine characterized by.